388812500 has 42 divisors (see below), whose sum is σ = 850653174. Its totient is φ = 155500000.

The previous prime is 388812497. The next prime is 388812503. The reversal of 388812500 is 5218883.

It is an interprime number because it is at equal distance from previous prime (388812497) and next prime (388812503).

It can be written as a sum of positive squares in 7 ways, for example, as 348718276 + 40094224 = 18674^2 + 6332^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388812503) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 59390 + ... + 65610.

It is an arithmetic number, because the mean of its divisors is an integer number (20253647).

Almost surely, 2^388812500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 388812500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (425326587).

388812500 is an abundant number, since it is smaller than the sum of its proper divisors (461840674).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

388812500 is an frugal number, since it uses more digits than its factorization.

388812500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6255 (or 6228 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 388812500 is about 19718.3290367110. The cubic root of 388812500 is about 729.8720611468.

The spelling of 388812500 in words is "three hundred eighty-eight million, eight hundred twelve thousand, five hundred".